Deionized water in coolant?

Started by neurosis, January 05, 2021, 07:34 AM

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neurosis

January 05, 2021, 07:34 AM Last Edit: December 31, 1969, 04:00 PM by Guest
What is the benefit of running de-ionized water in coolant?

This is the first time we've run in to this being a customer requirement.  What's the purpose?
I'll go back to being a conservative, when conservatives go back to being conservative.

JParis

#1
January 05, 2021, 07:56 AM Last Edit: December 31, 1969, 04:00 PM by Guest
Quote from: neurosis post_id=1817 time=1609860871 user_id=49What is the benefit of running de-ionized water in coolant?

This is the first time we've run in to this being a customer requirement.  What's the purpose?


We do alot of 7075 aluminum...without it, we find that letting the parts sit for any length of time causes issues with plating because of a galvanic reaction between the water/coolant and material

neurosis

#2
January 05, 2021, 08:22 AM Last Edit: December 31, 1969, 04:00 PM by Guest
Quote from: JParis post_id=1820 time=1609862174 user_id=139We do alot of 7075 aluminum...without it, we find that letting the parts sit for any length of time causes issues with plating because of a galvanic reaction between the water/coolant and material


That makes sense.  The particular job we are looking at gets etched before any finish.  That's what had me a little baffled.  

The job is 2nd tier and the customer name is redacted from all drawings so we have no idea who this is for. I was curious why they would have a blanket requirement like that.

The particular parts are titanium.
I'll go back to being a conservative, when conservatives go back to being conservative.

Matthew Hajicek

#3
January 05, 2021, 09:12 AM Last Edit: December 31, 1969, 04:00 PM by Guest
If you have hard water, you can get galvanic corrosion of the machine.  I had huge rust problems before installing a DI system.

RobertELee

#4
January 05, 2021, 10:27 AM Last Edit: December 31, 1969, 04:00 PM by Guest
Likely a blanket cookie cutter form that engineer/company uses for all parts so the important parts don't get missed. I highly doubt titanium will have a reaction. However following customer orders is a good idea.  Call up your local Culligan/water conditioning company and ask for a deionizing system. You can get as big or small as needed, typically just a fiberglass resin tank and filter.
We had one for the WEDMs at a previous employer, I tried using it in the mills for a bit but never noticed it making any difference on our parts. Someone mentioned it doesn't evaporate as fast but can't confirm that.
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